Add initial README.md file

Author: augustoproiete

README.md

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+# Serilog.Sinks.ExcelDnaLogDisplay
+
+Writes [Serilog](https://serilog.net) events to [Excel-DNA](https://excel-dna.net) LogDisplay.
+
+![Excel-DNA LogDisplay window screenshot](assets/exceldna-logdisplay-window.png)
+
+---
+
+_Copyright © 2018 Caio Proiete & Contributors - Provided under the [Apache License, Version 2.0](http://apache.org/licenses/LICENSE-2.0.html)._